What is PCI Express? Do PCIe lanes, slots, and versions matter?

What is PCI Express? Do PCIe lanes, slots, and versions matter? pcie slot length As per Wikipedia and other sites, the dimensions of the half-length PCIe card are mm × mm But as per the specification: enter pciex16 slot configuration Handle 0x001D, DMI type 9, 17 bytes System Slot Information Designation: J6B1 Type: x1 PCI Express Current Usage: In Use Length: Short ID: 1 ==

pciex16 slot configuration Card capacity and size · Slot 1: gen 4, up to x16 lanes · Slot 2: gen 4, up to x16 lanes · Slot 3: gen 4, up to x8 lanes

pcie 4 gpu in pcie 3 slot PCI Express expansion slot of industrial computer, PCI Express cards Physical 2 module is accommodating on width and length, and the standard is The PCIe design guidelines and standards define up to 16 available lanes, which also define the size of standardized PCIe card slots